Microsoft Visual Basic Example Application: Solas Property Rental

	MS Visual Basic Example Application: Solas Property Rental

Introduction

Solas Property Rental is a fictitious company that manages various types of real estate properties and rents them to customers. The types of properties include apartments, townhouses, and single families. In this application, we simulate various customer-oriented transactions, including registering the potential tenants, assigning the properties to them, and collecting payments.

This application was created to illustrate the various techniques of performing operations on XML elements: creating the elements, locating the values, and displaying them.

Practical Learning: Introducing the Application

Start Microsoft Visual Basic and create a new Windows Forms Application named SolasPropertyRental1
To add a new form to the application, in the Solution Explorer, right-click SolasPropertyRental1 -> Add -> Windows Form...
Set the Name to Tenants and click Add
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	TextAlign	Width
colAccountNumber	Account #		65
colFullName	Full Name		120
colMaritalStatus	Marital Status		85
colPhoneNumber	Phone #	Center	85

Design the form as follows:

Control	Text	Name	Other Properties
ListView		lvwTenants	Anchor: Top, Bottom, Left, Right FullRowSelect: True GridLines: True View: Details
Button	New Tenant...	btnNewTenant	Anchor: Bottom, Right
Button	Close	btnClose	Anchor: Bottom, Right

Right-click the Tenants form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class Tenants

End Class

Just above the End Class line, define a new procedure as follows:

Private Sub ShowTenants()
    Dim Filename As String = "C:\Solas Property Rental\tenants.xml"
    Dim docTenants As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        lvwTenants.Items.Clear()

        docTenants.Load(Filename)
        Dim TenantElement As XmlElement = docTenants.DocumentElement
        Dim ListOfTenants As XmlNodeList = TenantElement.ChildNodes

        For Each Node As XmlNode In ListOfTenants
            Dim lviTenant As ListViewItem = New ListViewItem(Node.FirstChild.InnerText) ' Account Number

            lviTenant.SubItems.Add(Node.FirstChild.NextSibling.InnerText) ' Full Name
            lviTenant.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.InnerText) ' Phone Number
            lviTenant.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.InnerText) ' Marital Status
            lvwTenants.Items.Add(lviTenant)
        Next
    End If
End Sub

In the Class Name combo box, select (Tenants Events)

In the Method Name combo box, select Load and implement the event as follows:

Private Sub TenantsLoad(ByVal sender As Object, 
                             ByVal e As System.EventArgs) 
                             Handles Me.Load
    ShowTenants()
End Sub

To add another form to the application, in the Solution Explorer, right-click SolasPropertyRental1 -> Add -> Windows Form...
Set the Name to TenantEditor and click Add

Design the form as follows:

Control	Text	Name	Properties
Label	&Account #:
MaskedTextBox		txtAccountNumber	Mask: 00-00-00 Modifiers: public
Label	&Full Name:
TextBox		txtFullName	Modifiers: public
Label	Marital Status:
ComboBox		txtMaritalStatus	Modifiers: public Items: Single Widow Married Divorced Separated
Label	&Phone #:
MaskedTextBox		txtPhoneNumber	Mask: (999) 000-0000 Modifiers: public
Button	OK	btnOK	DialogResult: OK
Button	Cancel	btnCancel	DialogResult: Cancel
Form			AcceptButton: btnOK CancelButton: btnCancel FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

To add a new form to the application, in the Solution Explorer, right- click SolasPropertyRental4 -> Add -> Windows Form...
Set the Name to RentalProperties and press Enter
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	TextAlign	Width
colPropertyCode	Prop Code		65
colPropertyType	Property Type		85
colBedrooms	Bedrooms	Right	65
colBathrooms	Bathrooms	Right	65
colMonthlyRent	Monthly Rent	Right	75
colStatus	Status		65

Design the form as follows:

Control	Text	Name	Other Properties
ListView		lvwProperties	View: Details GridLines: True FullRowSelect: True Anchor: Top, Bottom, Left, Right
Button	New Property...	btnNewProperty	Anchor: Bottom, Right
Button	Close	btnClose	Anchor: Bottom, Right

Right-click the Tenants form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class RentalProperties

End Class

Just above the End Class line, define a new procedure as follows:

Private Sub ShowProperties()
    Dim DOMProperties As XmlDocument = New XmlDocument
    Dim Filename As String = "C:\Solas Property Rental\properties.xml"

    If File.Exists(Filename) Then
        lvwProperties.Items.Clear()

        DOMProperties.Load(Filename)
        Dim RootProperty As XmlElement = DOMProperties.DocumentElement
        Dim ListOfProperties As XmlNodeList = RootProperty.ChildNodes

        For Each Node As XmlNode In ListOfProperties
            Dim lviProperty As ListViewItem = New ListViewItem(Node.FirstChild.InnerText) ' Property Code

            lviProperty.SubItems.Add(Node.FirstChild.NextSibling.InnerText) ' Property Type
            lviProperty.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.InnerText) ' Bedrooms
            lviProperty.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.InnerText) ' Bathrooms
            lviProperty.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Monthly Rent
            lviProperty.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Status
            lvwProperties.Items.Add(lviProperty)
        Next
    End If
End Sub

In the Class Name combo box, select (RentalProperties Events)

In the Method Name combo box, select Load and implement the event as follows:

Private Sub RentalPropertiesLoad(ByVal sender As Object, 
                                      ByVal e As System.EventArgs) 
                                      Handles Me.Load
    ShowProperties()
End Sub

To add another form to the application, in the Solution Explorer, right- click SolasPropertyRental1 -> Add -> Windows Form...
Set the Name to PropertyEditor and click Add

Design the form as follows:

Control	Text	Name	Properties
Label	Property Code:
MaskedTextBox		txtPropertyCode	Mask: 000-000 Modifiers: Public
Button	OK	btnOK	DialogResult: OK
Label	Property Type:
ComboBox		cbxPropertyTypes	Modifiers: Public Items: Unknown Apartment Townhouse Single Family
Button	Cancel	btnCancel	DialogResult: Cancel
Label	Bedrooms:
TextBox	0	txtBedrooms	TextAlign: Right Modifiers: Public
Label	Bathrooms:
TextBox	0.00	txtBathrooms	TextAlign: Right Modifiers: Public
Label	Monthly Rent:
TextBox	0.00	txtMonthlyRent	TextAlign: Right Modifiers: Public
Label	Occupancy Status:
ComboBox	Unknown	cbxStatus	Modifiers: Public Items: Unknown Available Occupied Needs Repair
Form			AcceptButton: btnOK CancelButton: btnCancel FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

To add a new form to the application, in the Solution Explorer, right-click SolasPropertyRental1 -> Add -> Windows Form...
Set the Name to RentalAllocation and click Add

Design the form as follows:

Solas Property Rental: Rental Allocation

Control	Text	Name	Other Properties
Label	Rent Allocation		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft
Label	Allocation Code:
MaskedTextBox		txtAllocationCode	Mask: 0000-9999 Modifiers: Public
Label	Date Allocated:
DateTimePicker		dtpDateAllocated	Format: Short Modifiers: Public
Label	Tenant		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft
Label	Property		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft

Label	Account #:
MaskedTextBox		txtTenantAcntNbr	Mask: 00-00-00 Modifiers: Public
Label	Property #:
MaskedTextBox		txtPropertyCode	Mask: 000-000 Modifiers: Public
Label	Tenant Name
TextBox		txtTenantName	Modifiers: Public
Label	Property Type:
TextBox		txtPropertyType	Modifiers: Public
Label	Marital Status:
TextBox		txtMaritalStatus	Modifiers: Public
Label	Monthly Rent:
TextBox		txtMonthlyRent
Label	Allocation Evaluation		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft
Label	Contract Length:
ComboBox		cbxContractLength	Items: Monthly 3 Months 6 Months 12 Months Modifiers: Public
Label	Rent Start Date:
DateTimePicker		dtpRentStartDate	Modifiers: Public
Button	OK	btnOK	DialogResult: OK
Button	Close	btnClose	DialogResult: Cancel
Form			AcceptButton: btnOK CancelButton: btnClose FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

Right-click the RentalAllocation form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class RentalAllocation

End Class

In the Class Name combo box, select txtTenantAcntNbr

In the Method Name combo box, select Leave and implement the event as follows:

Private Sub txtTenantAcntNbrLeave(ByVal sender As Object, 
                                       ByVal e As System.EventArgs) 
                                       Handles txtTenantAcntNbr.Leave
    Dim Filename As String = "C:\Solas Property Rental\tenants.xml"
    Dim docTenants As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        docTenants.Load(Filename)
        Dim TenantElement As XmlElement = docTenants.DocumentElement
        Dim ListOfTenants As XmlNodeList = TenantElement.ChildNodes
        Dim TenantFound As Boolean = False

        For i = 0 To ListOfTenants.Count - 1
            Dim Node As XmlNode = ListOfTenants(i)

            If Node.FirstChild.InnerText = txtTenantAcntNbr.Text Then
                TenantFound = True
                txtTenantName.Text = Node.FirstChild.NextSibling.InnerText
                txtMaritalStatus.Text = Node.FirstChild.NextSibling.NextSibling.InnerText
            End If
        Next

        If TenantFound = False Then
            MsgBox("There is no tenant with that account number")
            txtTenantAcntNbr.Text = ""
        End If
    Else
        MsgBox("There is no list of tenants to check.")
    End If
End Sub

In the Class Name combo box, select txtPropertyCode

In the Method Name combo box, select Leave and implement the event as follows:

Private Sub txtPropertyCodeLeave(ByVal sender As Object, 
                                  ByVal e As System.EventArgs) 
                                  Handles txtPropertyCode.Leave
    Dim Filename As String = "C:\Solas Property Rental\properties.xml"
    Dim DOMProperties As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        DOMProperties.Load(Filename)
        Dim PropertyElement As XmlElement = DOMProperties.DocumentElement
        Dim ListOfProperties As XmlNodeList = PropertyElement.ChildNodes
        Dim PropertyFound As Boolean = False

        For i = 0 To ListOfProperties.Count - 1
            Dim Node As XmlNode = ListOfProperties(i)

            If Node.FirstChild.InnerText = txtPropertyCode.Text Then
                PropertyFound = True
                txtPropertyType.Text = Node.FirstChild.NextSibling.InnerText
                txtMonthlyRent.Text = Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.InnerText
            End If
        Next

        If PropertyFound = False Then
            MsgBox("There is no Property with that code")
            txtPropertyType.Text = ""
        End If
    Else
        MsgBox("There is no list of properties to check.")
    End If
End Sub

To add a new form to the application, in the Solution Explorer, right-click SolasPropertyRental1 -> Add -> Windows Form...
Set the Name to RentalAllocations and press Enter
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	TextAlign	Width
colAllocationCode	Alloc Code		65
colDateAllocated	Date Allocated	Center	85
colTenantAccount	Tenant #	Center	65
colTenantName	Tenant Name		100
colPropertyCode	Prop Code	Center	65
colPropertyType	Prop Type		75
colContractLength	Contract Length		88
colRentStartDate	Rent Start Date	Center	88
colMonthlyRent	Monthly Rent	Right	76

Design the form as follows:

Solas Property Rental: Rental Allocations

Control	Text	Name	Other Properties
ListView		lvwAllocations	View: Details GridLines: True FullRowSelect: True Anchor: Top, Bottom, Left, Right
Button	New Rental Allocation...	btnNewAllocation	Anchor: Bottom, Right
Button	Close	btnClose

Right-click the Rental Allocations form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class RentalAllocations

End Class

In the Class Name combo box, select txtTenantAcntNbr

In the Method Name combo box, select Leave and implement the event as follows:

Private Sub ShowRentalAllocations()
    Dim Filename As String = "C:\Solas Property Rental\contracts.xml"
    Dim docAllocations As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        lvwAllocations.Items.Clear()

        docAllocations.Load(Filename)
        Dim AllocationElement As XmlElement = docAllocations.DocumentElement
        Dim ListOfAllocations As XmlNodeList = AllocationElement.ChildNodes

        For Each Node As XmlNode In ListOfAllocations
            Dim lviAllocation As ListViewItem = New ListViewItem(Node.FirstChild.InnerText) ' Allocation Code

            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.InnerText) ' Date Allocated
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.InnerText) ' Tenant Account Number
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.InnerText) ' Tenant Name
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Property Code
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Property Type
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Contract Length
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Rent Start Date
            lviAllocation.SubItems.Add(Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Monthly Rent
            lvwAllocations.Items.Add(lviAllocation)
        Next
    End If
End Sub

In the Class Name combo box, select (RentalAllocations Events)

In the Method Name combo box, select Load and implement the event as follows:

Private Sub RentalAllocationsLoad(ByVal sender As Object, 
                                       ByVal e As System.EventArgs) 
                                       Handles Me.Load
    ShowRentalAllocations()
End Sub

To add a new form to the application, in the Solution Explorer, right-click SolasPropertyRental4 -> Add -> Windows Form...
Set the Name to RentPayment and click Add

Design the form as follows:

Control	Text	Name	Other Properties
Label	Rent Allocation		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft
Label	Date Received:
DateTimePicker		dtpDateReceived	Format: Short Modifiers: Public
Label	Allocation Code:
MaskedTextBox		txtAllocationCode	Mask: 0000-9999 Modifiers: Public
Label	Receipt #:
TextBox		txtReceiptNumber	Modifiers: Public
Label	Tenant Account #:
TextBox		txtTenantAcntNber	Modifiers: Public
Label	Property Code:
TextBox		txtPropertyCode	Modifiers: Public
Label	Tenant Name:
TextBox		txtTenantName	Modifiers: Public
Label	Property Type:
TextBox		txtPropertyType	Modifiers: Public
Label	Payment Summary		AutoSize: False BackColor: Gray BorderStyle: FixedSingle ForeColor: White TextAlign: MiddleLeft
Label	Month:
Label	Year:
Label	Payment For:
ComboBox		cbxMonths	Modifiers: Public Items: January February March April May June July August September October November December
TextBox		txtYear	Modifiers: Public
Label	Amount Received:
TextBox	0.00	txtAmountReceived	TextAlign: Right Modifiers: Public
Button	OK	btnOK	DialogResult: OK
Button	Close	btnClose	DialogResult: Cancel
Form			AcceptButton: btnOK CancelButton: btnClose FormBorderStyle: FixedDialog MaximizeBox: False MinimizeBox: False ShowInTaskbar: False

Right-click the Rent Payment form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class RentPayment

End Class

In the Class Name combo box, select txtAllocationCode

In the Method Name combo box, select Leave and implement the event as follows:

Private Sub txtAllocationCodeLeave(ByVal sender As Object, 
                                    ByVal e As System.EventArgs) 
                                    Handles txtAllocationCode.Leave
    Dim Filename As String = "C:\Solas Property Rental\contracts.xml"
    Dim docAllocations As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        docAllocations.Load(Filename)
        Dim AllocationElement As XmlElement = docAllocations.DocumentElement
        Dim ListOfAllocations As XmlNodeList = AllocationElement.ChildNodes
        Dim ContractFound As Boolean = False

        For i = 0 To ListOfAllocations.Count - 1
            Dim Node As XmlNode = ListOfAllocations(i)

            If Node.FirstChild.InnerText = txtAllocationCode.Text Then
                ContractFound = True
                txtTenantAcntNber.Text = Node.FirstChild.NextSibling.NextSibling.InnerText
                txtTenantName.Text = Node.FirstChild.NextSibling.NextSibling.NextSibling.InnerText
                txtPropertyCode.Text = Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText
                txtPropertyType.Text = Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText
                txtAmountReceived.Text = Node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText
            End If
        Next

        If ContractFound = False Then
            MsgBox("There is no rental contract with that number")
            txtTenantAcntNber.Text = ""
        End If
    Else
        MsgBox("There is no list of rental contracts to check.")
    End If
End Sub

To add a new form to the application, in the Solution Explorer, right- click SolasPropertyRental4 -> Add -> Windows Form...
Set the Name to RentPayments and press Enter
From the Toolbox, add a ListView to the form

While the new list view is still selected, in the Properties window, click the ellipsis button of the Columns field and create the columns as follows:

(Name)	Text	TextAlign	Width
colReceiptNumber	Receipt #	Right
colDateReceived	Date Received	Center	85
colAllocationCode	Alloc Code	Center	65
colTenantAccount	Tenant #	Center	65
colTenantName	Tenant Name		100
colPropertyCode	Prop Code	Center	65
colPropertyType	Prop Type		75
colPaymentFor	Payment For		88
colAmountReceived	Amount	Right	50

Design the form as follows:

Control	Text	Name	Other Properties
ListView		lvwRentPayments	View: Details GridLines: True FullRowSelect: True Anchor: Top, Bottom, Left, Right
Button	New Rent Payment...	btnNewPayment	Anchor: Bottom, Right
Button	Close	btnClose	Anchor: Bottom, Right

Right-click the Rent Payments form and click View Code

Import the System.IO and the System.Xml namespaces:

Imports System.IO
Imports System.Xml

Public Class RentPayments

End Class

In the Class Name combo box, select txtTenantAcntNbr

In the Method Name combo box, select Leave and implement the event as follows:

Private Sub ShowRentPayments()
    Dim Filename As String = "C:\Solas Property Rental\payments.xml"
    Dim DocumentPayments As XmlDocument = New XmlDocument

    If File.Exists(Filename) Then
        lvwRentPayments.Items.Clear()

        DocumentPayments.Load(Filename)
        Dim AllocationElement As XmlElement = DocumentPayments.DocumentElement
        Dim ListOfAllocations As XmlNodeList = AllocationElement.ChildNodes

        For Each Node As XmlNode In ListOfAllocations
            Dim lviPayment As ListViewItem = New ListViewItem(node.FirstChild.InnerText) ' Receipt Number

            lviPayment.SubItems.Add(node.FirstChild.NextSibling.InnerText) ' Date Received
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.InnerText) ' Allocation Code
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.InnerText) ' Tenant Account Number
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.InnerText)  ' Tenant Name
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Property Code
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Property Type
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Payment For
            lviPayment.SubItems.Add(node.FirstChild.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.NextSibling.InnerText) ' Amount
            lvwRentPayments.Items.Add(lviPayment)
        Next
    End If
End Sub

In the Class Name combo box, select (RentPayments.Events)

In the Method Name combo box, select Load and implement the event as follows:

Private Sub RentPaymentsLoad(ByVal sender As Object, 
                                  ByVal e As System.EventArgs) 
                                  Handles Me.Load
    ShowRentPayments()
End Sub

In the Solution Explorer, right-click Form1.vb and click Rename
Set the name to Central.vb and press Enter twice to display the form

Design the form as follows:

Control	Text	Name
Button	Tenants	btnTenants
Button	Rental Properties	btnRentalProperties
Button	Rental Allocations	btnRentalAllocations
Button	C&lose	btnClose

Right-click the form and click View Code
In the Class Name combo box, select btnRentPayment

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnRentPaymentsClick(ByVal sender As Object, 
                                  ByVal e As System.EventArgs) 
                                  Handles btnRentPayments.Click
    Dim frmPayment As RentPayments = New RentPayments
    frmPayment.Show()
nd Sub

In the Class Name combo box, select btnRentalAllocations

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnRentalAllocationsClick(ByVal sender As Object, 
                                       ByVal e As System.EventArgs) 
                                       Handles btnRentalAllocations.Click
    Dim frmAllocations As RentalAllocations = New RentalAllocations
    frmAllocations.ShowDialog()
End Sub

In the Class Name combo box, select btnTenants

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnTenantsClick(ByVal sender As Object, 
                             ByVal e As System.EventArgs) 
                             Handles btnTenants.Click
    Dim frmTenants As Tenants = New Tenants
    frmTenants.ShowDialog()
End Sub

In the Class Name combo box, select btnRentalProperties

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnRentalPropertiesClick(ByVal sender As Object, 
                                      ByVal e As System.EventArgs) 
                                      Handles btnRentalProperties.Click
    Dim frmProperties As RentalProperties = New RentalProperties
    frmProperties.ShowDialog()
End Sub

In the Class Name combo box, select btnClose

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnCloseClick(ByVal sender As Object, 
                           ByVal e As System.EventArgs) 
                           Handles btnClose.Click
    End
End Sub

Save all

Practical Learning: Adding Tenants

In the Solution Explorer, right-click Tenants.vb and click View Code
In the Class Name combo box, select btnNewTenant

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnNewTenantClick(ByVal sender As Object, 
                                   ByVal e As System.EventArgs) 
                                   Handles btnNewTenant.Click
    Dim AccountNumber As String
    Dim FullName As String
    Dim MaritalStatus As String
    Dim PhoneNumber As String

    ' If this directory doesn't exist, create it
    Directory.CreateDirectory("C:\Solas Property Rental")
    ' This is the XML file that holds the list of tenants
    Dim Filename As String = "C:\Solas Property Rental\tenants.xml"
    ' This is the dialog box from where a tenant is created
    Dim editor As TenantEditor = New TenantEditor

    ' Display the Tenant Editor Dialog and find out if the 
    ' user clicked OK after filling its controls
    If editor.ShowDialog() = DialogResult.OK Then
        ' We will need a reference to the XML document
        Dim DOMTenants As XmlDocument = New XmlDocument

        ' Find out if the file exists already
        ' If it doesn't, then create it
        If Not File.Exists(Filename) Then
            DOMTenants.LoadXml( 
		"<?xml version=""1.0"" encoding=""utf-8""?>" & 
                               "<Tenants></Tenants>")
            DOMTenants.Save(Filename)
        End If

            ' At this time, we have a Tenants.xml file. Open it
            DOMTenants.Load(Filename)

            ' Get a reference to the root node
            Dim nodRoot As XmlElement = DOMTenants.DocumentElement

            ' Prepare the values of the XML element
            AccountNumber = editor.txtAccountNumber.Text
            FullName = editor.txtFullName.Text
            MaritalStatus = editor.cbxMaritalStatus.Text
            PhoneNumber = editor.txtPhoneNumber.Text

            ' Create an element named Tenant
            Dim TenantElement As XmlElement = 
		DOMTenants.CreateElement("Tenant")
            ' Create the XML code of the child element of Tenant
            Dim strTenant As String = "<AccountNumber>" & AccountNumber & 
                                      "</AccountNumber>" & 
                                      "<FullName>" + FullName & 
                                      "</FullName>" & 
                                      "<MaritalStatus>" & MaritalStatus & 
                                      "</MaritalStatus>" & 
                                      "<PhoneNumber>" & PhoneNumber & 
                                      "</PhoneNumber>"
            TenantElement.InnerXml = strTenant
            ' Append the new element as a child of Tenant
            DOMTenants.DocumentElement.AppendChild(TenantElement)

            ' Save the XML file
            DOMTenants.Save("C:\Solas Property Rental\tenants.xml")
            ' Since the content of the XML file has just been changed,
            ' re-display the list of tenants
            ShowTenants()
        End If
End Sub

In the Class Name combo box, select btnClose

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnCloseClick(ByVal sender As Object, 
                               ByVal e As System.EventArgs) 
                               Handles btnClose.Click
        Close()
End Sub

In the Solution Explorer, right-click RentalProperties.vb and click View Code
In the Class Name combo box, select btnNewProperty

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnNewPropertyClick(ByVal sender As Object, 
                                     ByVal e As System.EventArgs) 
                                     Handles btnNewProperty.Click
        ' If this directory doesn't exist, create it
        Directory.CreateDirectory("C:\Solas Property Rental")
        ' This is the XML file that holds the list of proeprties
        Dim Filename As String = "C:\Solas Property Rental\properties.xml"
        Dim Editor As PropertyEditor = New PropertyEditor

        Dim RandomNumber As Random = New Random
        Editor.txtPropertyCode.Text = RandomNumber.Next(100000, 999999)

        If Editor.ShowDialog() = DialogResult.OK Then
            Dim PropertyCode As String
            Dim PropertyType As String
            Dim Status As String
            Dim Bedrooms As Integer
            Dim Bathrooms As Single
            Dim MonthlyRent As Double

            ' We will need a reference to the XML document
            Dim docProperty As XmlDocument = New XmlDocument

            ' Find out if the file exists already
            ' If it doesn't, then create it
            If Not File.Exists(Filename) Then
                docProperty.LoadXml( 
			"<?xml version=""1.0"" encoding=""utf-8""?>" & 
                                    "<Properties></Properties>")
                docProperty.Save(Filename)
            End If

            ' Open the XML file
            docProperty.Load(Filename)

            ' Get a reference to the root node
            Dim nodRoot As XmlElement = docProperty.DocumentElement

            PropertyCode = Editor.txtPropertyCode.Text
            PropertyType = Editor.cbxPropertyTypes.Text
            Bedrooms = CInt(Editor.txtBedrooms.Text)
            Bathrooms = CSng(Editor.txtBathrooms.Text)
            MonthlyRent = Double.Parse(Editor.txtMonthlyRent.Text)
            Status = Editor.cbxStatus.Text

            Dim PropertyElement As XmlElement = 
		docProperty.CreateElement("Property")
            Dim strNewCustomer As String = "<PropertyCode>" & PropertyCode & 
                                    "</PropertyCode>" & "<PropertyType>" & 
                                    PropertyType & "</PropertyType>" & 
                                    "<Bedrooms>" & Bedrooms + "</Bedrooms>" & 
                                    "<Bathrooms>" & FormatNumber(Bathrooms) & 
                                    "</Bathrooms>" & "<MonthlyRent>" & 
                                    FormatNumber(MonthlyRent) & 
                                    "</MonthlyRent>" & 
                                    "<Status>" & Status & "</Status>"

            PropertyElement.InnerXml = strNewCustomer
            docProperty.DocumentElement.AppendChild(PropertyElement)

            docProperty.Save("C:\Solas Property Rental\properties.xml")
            ShowProperties()
        End If
End Sub

In the Class Name combo box, select btnClose

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnCloseClick(ByVal sender As Object, 
                               ByVal e As System.EventArgs) 
                               Handles btnClose.Click
        Close()
End Sub

Execute the application

Use the Tenants button and its New Tenant button to create the following Tenants:

Account #	Full Name	Marital Status	Phone #
20-48-46	Lenny Crandon	Single	(240) 975-9093
57-97-15	Joan Ramey	Married	(301) 304-5845
19-38-84	Peter Sellars	Married	(240) 801-7974
24-68-84	Alberta Sanson	Separated	(202) 917-0095
47-80-95	Urlus Flack	Single	(703) 203-7947

Use the Rental Properties button and its New Property button to create the following properties:

Prop Code	Property Types	Bedrooms	Bathrooms	Monthly Rent	Status
527-992	Apartment	1	1	925	Available
726-454	Apartment	2	1	1150.5	Available
476-473	Single Family	5	3.5	2250.85	Occupied
625-936	Townhouse	3	2.5	1750	Available
179-738	Townhouse	4	2.5	1920.5	Available
727-768	Single Family	4	2.5	2140.5	Needs Repair
371-801	Apartment	3	2	1250.25	Available
241-536	Townhouse	3	1.5	1650.5	Occupied

Close the forms and return to your programming environment

Practical Learning: Assigning a Property

In the Solution Explorer, right-click RentalAllocations.vb and click View Code
In the Class Name combo box, select btnNewAllocation

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnNewAllocationClick(ByVal sender As Object, 
                                       ByVal e As System.EventArgs) 
                                       Handles btnNewAllocation.Click
    Dim AllocationCode As String
    Dim TenantAccountNumber As String
    Dim TenantName As String
    Dim MaritalStatus As String
    Dim PropertyCode As String
    Dim PropertyType As String
    Dim ContractLength As String
    Dim DateAllocated As DateTime
    Dim RentStartDate As Date
    Dim MonthlyRent As Double

    Dim Editor As RentalAllocation = New RentalAllocation
    Directory.CreateDirectory("C:\Solas Property Rental")
    Dim Filename As String = "C:\Solas Property Rental\contracts.xml"

    If Editor.ShowDialog() = DialogResult.OK Then
        Dim DOMAllocation As XmlDocument = New XmlDocument

        If Not File.Exists(Filename) Then
            DOMAllocation.LoadXml( 
		"<?xml version=""1.0"" encoding=""utf-8""?>" & 
                "<Allocations></Allocations>")
            DOMAllocation.Save(Filename)
        End If

        DOMAllocation.Load(Filename)

        Dim nodRoot As XmlElement = DOMAllocation.DocumentElement

        AllocationCode = Editor.txtAllocationCode.Text
        DateAllocated = Editor.dtpDateAllocated.Value
        TenantAccountNumber = Editor.txtTenantAcntNbr.Text
        TenantName = Editor.txtTenantName.Text
        MaritalStatus = Editor.txtMaritalStatus.Text
        PropertyCode = Editor.txtPropertyCode.Text
        PropertyType = Editor.txtPropertyType.Text
        MonthlyRent = Double.Parse(Editor.txtMonthlyRent.Text)
        ContractLength = Editor.cbxContractLengths.Text
        RentStartDate = Editor.dtpRentStartDate.Value

        Dim RootElement As XmlElement = DOMAllocation.DocumentElement
        Dim AllocationElement As XmlElement = 
		DOMAllocation.CreateElement("RentalAllocation")
        RootElement.AppendChild(AllocationElement)

        RootElement = DOMAllocation.DocumentElement

        AllocationElement = DOMAllocation.CreateElement("AllocationCode")
        Dim txtAllocation As XmlText = 
		DOMAllocation.CreateTextNode(AllocationCode)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("DateAllocated")
        txtAllocation = 
		DOMAllocation.CreateTextNode(DateAllocated.ToString("d"))
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = 
		DOMAllocation.CreateElement("TenantAccountNumber")
        txtAllocation = 
		DOMAllocation.CreateTextNode(TenantAccountNumber)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("TenantName")
        txtAllocation = DOMAllocation.CreateTextNode(TenantName)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("MaritalStatus")
        txtAllocation = DOMAllocation.CreateTextNode(MaritalStatus)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("PropertyCode")
        txtAllocation = DOMAllocation.CreateTextNode(PropertyCode)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("PropertyType")
        txtAllocation = DOMAllocation.CreateTextNode(PropertyType)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("ContractLength")
        txtAllocation = DOMAllocation.CreateTextNode(ContractLength)
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("RentStartDate")
        txtAllocation = 
		DOMAllocation.CreateTextNode(RentStartDate.ToString("d"))
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        AllocationElement = DOMAllocation.CreateElement("MonthlyRent")
        txtAllocation = 
		DOMAllocation.CreateTextNode(FormatNumber(MonthlyRent))
        RootElement.LastChild.AppendChild(AllocationElement)
        RootElement.LastChild.LastChild.AppendChild(txtAllocation)

        DOMAllocation.Save(Filename)
        ShowRentalAllocations()
    End If
End Sub

In the Class Name combo box, select btnClose

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnCloseClick(ByVal sender As Object, 
                               ByVal e As System.EventArgs) 
                               Handles btnClose.Click
    Close()
End Sub

In the Solution Explorer, right-click RentPayments.vb and click View Code
In the Class Name combo box, select btnRentPayment

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnNewPaymentClick(ByVal sender As Object, 
                                    ByVal e As System.EventArgs) 
                                    Handles btnNewPayment.Click
        Dim ReceiptNumber As Integer
        Dim AllocationCode As String
        Dim TenantAccountNumber As String
        Dim TenantName As String
        Dim PaymentFor As String
        Dim PropertyCode As String
        Dim PropertyType As String
        Dim DateReceived As DateTime
        Dim AmountReceived As Double

        Dim Editor As RentPayment = New RentPayment
        Dim DOMPayment As XmlDocument = New XmlDocument
        Directory.CreateDirectory("C:\Solas Property Rental")
        Dim Filename As String = "C:\Solas Property Rental\payments.xml"

        ' If some payments were previously made
        If File.Exists(Filename) Then
            ' Open the payments.xml file
            DOMPayment.Load(Filename)

            ' Locate the root element
            Dim AllocationElement As XmlElement = DOMPayment.DocumentElement
            ' Get a list of the child nodes
            Dim ListOfAllocations As XmlNodeList = AllocationElement.ChildNodes

            ' Get the last receipt number
            ReceiptNumber = 
                CInt(ListOfAllocations(ListOfAllocations.Count 
                                        - 1).FirstChild.InnerText) + 1

            Editor.txtReceiptNumber.Text = ReceiptNumber.ToString()
        Else
            ' If no payment has ever been made,
            ' create a new XML file for the payments
            DOMPayment.LoadXml("<?xml version=""1.0"" encoding=""utf-8""?>" & 
                               "<RentPayments></RentPayments>")

            ' We will start the receipt numbers at 101
            ReceiptNumber = 101

            Editor.txtReceiptNumber.Text = ReceiptNumber
        End If

        ' Display the Rent Payment dialog box
        If Editor.ShowDialog() = DialogResult.OK Then
            ' If the user had clicked OK,
            ' Prepare the elements of the XML file
            ReceiptNumber = CInt(Editor.txtReceiptNumber.Text)
            DateReceived = Editor.dtpDateReceived.Value
            AllocationCode = Editor.txtAllocationCode.Text
            TenantAccountNumber = Editor.txtTenantAcntNber.Text
            TenantName = Editor.txtTenantName.Text
            PropertyCode = Editor.txtPropertyCode.Text
            PropertyType = Editor.txtPropertyType.Text
            PaymentFor = Editor.cbxMonths.Text + " " + Editor.txtYear.Text
            AmountReceived = CDbl(Editor.txtAmountReceived.Text)

            ' Get a reference to the root element
            Dim RootElement As XmlElement = DOMPayment.DocumentElement
            ' Create an element named Payment
            Dim PaymentElement As XmlElement = DOMPayment.CreateElement("Payment")
            ' Add the new element as the last node of the root element
            RootElement.AppendChild(PaymentElement)

            ' Get a reference to the root element
            RootElement = DOMPayment.DocumentElement

            ' Create an element
            PaymentElement = DOMPayment.CreateElement("ReceiptNumber")
            ' Create the value of the new element
            Dim TextPayment As XmlText = DOMPayment.CreateTextNode(ReceiptNumber)
            ' Add the new element as a child of the Payment element
            RootElement.LastChild.AppendChild(PaymentElement)
            ' Specify the value of the new element
            RootElement.LastChild.LastChild.AppendChild(TextPayment)

            ' Follow the same logic for the other elements

            PaymentElement = DOMPayment.CreateElement("DateReceived")
            TextPayment = DOMPayment.CreateTextNode(DateReceived.ToString("d"))
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextPayment)

            PaymentElement = DOMPayment.CreateElement("AllocationCode")
            Dim TextAllocation As XmlText = DOMPayment.CreateTextNode(AllocationCode)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("TenantAccountNumber")
            TextAllocation = DOMPayment.CreateTextNode(TenantAccountNumber)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("TenantName")
            TextAllocation = DOMPayment.CreateTextNode(TenantName)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("PropertyCode")
            TextAllocation = DOMPayment.CreateTextNode(PropertyCode)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("PropertyType")
            TextAllocation = DOMPayment.CreateTextNode(PropertyType)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("PaymentFor")
            TextAllocation = DOMPayment.CreateTextNode(PaymentFor)
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            PaymentElement = DOMPayment.CreateElement("AmountReceived")
            TextAllocation = DOMPayment.CreateTextNode(FormatNumber(AmountReceived))
            RootElement.LastChild.AppendChild(PaymentElement)
            RootElement.LastChild.LastChild.AppendChild(TextAllocation)

            DOMPayment.Save(Filename)
            ShowRentPayments()
        End If
End Sub

In the Class Name combo box, select btnClose

In the Method Name combo box, select Click and implement the event as follows:

Private Sub btnCloseClick(ByVal sender As Object, 
                               ByVal e As System.EventArgs) 
                               Handles btnClose.Click
    Close()
End Sub

Execute the application

Create the following Rental Allocations:

	Allocation 1	Allocation 2	Allocation 3	Allocation 4
Allocation Code	4205-8274	5920-9417	2792-4075	7957-7294
Date Allocated	8/12/2002	2/18/2004	3/24/2004	10/26/2007
Account #	24-68-84	57-97-15	19-38-84	20-48-46
Prop Code	726-454	625-936	371-801	727-768
Contract Length	12 Months	3 Months	12 Months	6 Months
Start Date	10/1/2002	4/1/2004	6/1/2004	2/1/2008

Create the following Rent Payments:

	Date Received	Allocation Code	Payment For		Amount
	Date Received	Allocation Code	Month	Year	Amount
Payment 1	10/25/2002	4205-8274	October	2002	1150.50
Payment 2	11/28/2002	4205-8274	November	2002	1150.50
Payment 3	4/28/2004	5920-9417	April	2004	1750.00
Payment 4	7/5/2004	2792-4075	June	2004	1250.25
Payment 5	6/3/2004	5920-9417	May	2004	1750.00
Payment 6	7/30/2004	2792-4075	July	2004	1250.25
Payment 7	7/5/2004	5920-9417	June	2004	1750.00
Payment 8	12/30/2002	4205-8274	December	2002	1150.50

Close the form(s)

Exercises

Solas Property Rental

Open the Solas Property Rental database from this lesson
Configure the Rental Allocations form so that, after the user has entered a property code and pressed Tab (or when the control looses focus), the database will first check the status of the property. If the property is occupied, a message box will be displayed to the user and that particular property cannot be selected (the property code text box should be set empty)
Configure the Rent Payments so that the user can decide to see only the payments for one particular tenant (you can create a contextual menu so that if the user right-clicks a certain row and click View Tenant's Payments, the list view would display only that tenant's payments. Of course, make sure the user has a way to display all payments again)


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